What is the main action of CN II - Optic Nerve?

The primary function of the optic nerve (CN II) is to facilitate vision. It is responsible for transmitting visual information from the retina in the eye to the brain, where the information is processed and interpreted, allowing us to perceive our environment visually. The optic nerve carries signals related to light exposure and visual images, thus contributing to our sense of sight.

This essential action underscores the importance of the optic nerve in visual fidelity and functioning, supporting activities such as reading, recognizing faces, and navigating the surroundings. The distinction from the other sensory functions is clear, as the optic nerve does not play a role in touch, smell, or hearing, which are associated with different cranial nerves.